CBE - Certified Blockchain Expert Blockchain Foundational Concepts Questions and Answers

Question 1

Which of the following is the MOST accurate description of decentralization in the context of blockchain technology?

Accepted Answer

A system where control and decision-making are distributed across a network of participants rather than being held by a central authority.

Answer

A single server that manages and validates all transactions for enhanced speed.

Answer

A type of database where information is stored in a central location but can be accessed by multiple users.

Answer

The process of encrypting data to ensure that only authorized parties can access it.

Question 2

A financial consortium wants to create a blockchain for inter-bank transfers. They require high transaction speeds, control over who can participate, and data privacy. Which type of blockchain would be most suitable for this scenario?

Accepted Answer

Consortium Blockchain

Answer

Public Blockchain

Answer

Hybrid Blockchain

Answer

Private Blockchain

Question 3

What is the primary function of a cryptographic hash function in a blockchain?

Accepted Answer

To provide a unique, fixed-size digital fingerprint for data, ensuring its integrity and linking blocks together.

Answer

To execute the terms of a smart contract automatically.

Answer

To generate public and private keys for user wallets.

Answer

To reach an agreement among network participants on the validity of transactions.

Question 4

In a Proof of Stake (PoS) consensus mechanism, how are participants chosen to validate new blocks and add them to the chain?

Accepted Answer

Based on the amount of cryptocurrency they hold and are willing to 'stake' as collateral.

Answer

Based on who solves a complex mathematical puzzle the fastest.

Answer

Through a voting system where only elected delegates can validate blocks.

Answer

Randomly, with every node having an equal chance of being selected.

Question 5

A developer creates a self-executing agreement on a blockchain that automatically releases payment to a vendor once a shipment is confirmed as 'delivered' by a trusted oracle. What is this self-executing agreement called?

Accepted Answer

A Smart Contract

Answer

A Decentralized Application (DApp)

Answer

A Hash Function

Answer

A Genesis Block

Question 6

Which of the following components is NOT typically found within a block on a blockchain?

Accepted Answer

The private keys of the transaction senders

Answer

The hash of the previous block

Answer

A list of transactions

Answer

A timestamp